somandubey

function foo(){
  for (var i=1;i<6;i++) {
    var f = function(i) {
      var k = function(){console.log(i)};
      setTimeout(k,1000*i);
    }
    f(i);
  }
}
foo();

somandubey

# This number should be, at maximum, the number of CPU cores on your system. 
# (since nginx doesn't benefit from more than one worker per CPU.)
worker_processes 8;
 
 
# Determines how many clients will be served by each worker process.
# (Max clients = worker_connections * worker_processes)
# "Max clients" is also limited by the number of socket connections available on the system (~64k)
# run ss -s  and u'll see a timewait param
# The reason for TIMED_WAIT is to handle the case of packets arriving after the socket is closed. 

somandubey

How to increase ulimit in Linux:

• Step 1 (ulimit): open the sysctl.conf and add this line fs.file-max = 65536

    vi /etc/sysctl.conf   
  

  add following at end of file in above file:

    fs.file-max = 65536
  

save and exit.

somandubey

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh